c++观察者模式收集

来源：互联网发布：多目标粒子群算法代码编辑：程序博客网时间：2024/06/06 17:55

观察者模式

//// Created by caozw on 17-9-27.//#ifndef _OBSERVER_H_#define _OBSERVER_H_#include <string>#include <list>#include <algorithm>#include <string>#include <iostream>//观察者class Observer{public:    Observer() {}    virtual ~Observer() {}    virtual void Update() {}};//通知者class CISubject{public:    CISubject() {}    virtual ~CISubject() {}    void Attach(Observer *observer) { m_observers.push_back(observer); }     //添加观察者    void Remove(Observer *observer) { m_observers.remove(observer); }        //移除观察者    void Notify() //通知观察者    {        std::list<Observer*>::iterator iter = m_observers.begin();        for(; iter != m_observers.end(); iter++)            (*iter)->Update();    }    virtual void SetStatus(std::string s) { m_status = s; } //设置状态    virtual std::string GetStatus() { return m_status; }    //获得状态private:    std::list<Observer* > m_observers; //观察者链表protected:    std::string m_status; //状态};//具体通知者class BlogCSDN : public CISubject{private:    std::string m_name; //博主名称public:    BlogCSDN(std::string name): m_name(name) {}    ~BlogCSDN() {}    void SetStatus(std::string s) { m_status = "CSDN通知 : " + m_name + s; } //具体设置状态信息    std::string GetStatus() { return m_status; }};//具体观察者class ObserverBlog : public Observer{private:    std::string m_name;  //观察者名称    CISubject *m_blog;   //观察的博客，当然以链表形式更好，就可以观察多个博客public:    ObserverBlog(std::string name, CISubject *blog): m_name(name), m_blog(blog) {}    ~ObserverBlog() {}    void Update()  //获得更新状态    {        std::string status = m_blog->GetStatus();        std::cout<<m_name<<"-------"<<status<< std::endl;    }};#endif

实际使用例子：

#include <iostream>#include "observer.h"using namespace std;int main(){    CISubject *blog = new BlogCSDN("wuzhekai1985");    Observer *observer1 = new ObserverBlog("tutupig", blog);    blog->Attach(observer1);    blog->SetStatus("发表设计模式C++实现（15）——观察者模式");    blog->Notify();    delete blog;    delete observer1;    return 0;}

阅读全文

0 0